Answer:
B. Conserve, recycle, and reuse water in households
Explanation:
I think B will be the best way to prevent global shortage because...
A. If we stop planting trees and shrubs in gardens that will reduce water shortage just by a little and trees are very important for fresh air and are equally important as water so its not a nice way to prevent global water shortage.
C. It will be very hard for people who use washing machines and dishwashers to stop using them because they are not used to clean their clothes/dishes by themselves and would be a very hard task to stop using it.
D. Idk
